초록

Disclosed is an apparatus and process for producing multiple-layer film or sheeting which includes an improved laydown means comprising adjustable cam-actuated control means for controlling the polymer flow and individual layer thickness.

대표청구항 ▼

A valve plate for applying co-extruded thermoplastic synthetic resin streams to a base polymer layer or to other thermoplastic synthetic resin streams, comprising: a body portion, comprising: two cavities partially extending through the thickness thereof and positioned on opposite sides of a polymer

A valve plate for applying co-extruded thermoplastic synthetic resin streams to a base polymer layer or to other thermoplastic synthetic resin streams, comprising: a body portion, comprising: two cavities partially extending through the thickness thereof and positioned on opposite sides of a polymer base layer flow channel which extends entirely through said body portion; two receiving areas positioned radially outwardly of said cavities for receiving the thermoplastic synthetic resin streams, said streams passing from said receiving areas longitudinally across the openings of said cavities to said flow channel for application to said base layer; and a slotted end region for grasping and removing the valve plate; resin flow control means located in, but independent of and separately removable from, each of said cavities, said resin flow control means comprising an elliptically-shaped orifice and a resin engaging surface which is shaped according to flow considerations; and means for positioning said control means, said positioning means extending transversely from each of said cavities and longitudinally through said body portion and extending past the edge of said body portion and comprising a cam at the cavity end thereof, said cam engaging said elliptically-shaped orifice, wherein said cam, upon rotation, causes movement of said flow control means within said channel to control said resin flow to the base layer. A laydown means for the application of multiple layers of thermoplastic synthetic resinous material to an initial polymeric base layer, comprising: a feedblock for receiving at least one resin stream and for preparing said stream for application to the base layer; and a valve plate for receiving said stream from said feedblock and applying said stream to the base layer, said valve plate including: a body portion, comprising: two cavities partially extending through the thickness thereof and positioned on opposite sides of a polymer base layer flow channel which extends entirely through said body portion; two receiving areas positioned radially outwardly of said cavities for receiving the thermoplastic synthetic resin streams, said streams passing from said receiving areas longitudinally across the openings of said cavities to said flow channel for application to said base layer; and a slotted end region for grasping and removing the valve plate; resin flow control means located in, but independent of and separately removable from, each of said cavities, said resin flow control means comprising an elliptically-shaped orifice and a resin engaging surface which is shaped according to flow considerations; and means for positioning said control means, said positioning means extending transversely from each of said cavities and longitudinally through said body portion and extending past the edge of said body portion and comprising a cam at the cavity end thereof, said cam engaging said elliptically-shaped orifice, wherein said cam, upon rotation, causes movement of said flow control means within said channel to control said resin flow to the base layer. A laydown means as defined in claim 7, further comprising a means positioned for external adjustment comprising a cam for positioning said control means.